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Cao, F., Eskin, D., Leonenko, Y., 2020. Modeling of ex-situ dissolution for geologic sequestration of carbon dioxide in aquifers. Journal of Petroleum Science and Engineering 187, 106835.

http://www.sciencedirect.com/science/article/pii/S0920410519312525 Underground carbon dioxide (CO ) sequestration is considered to be one of the main methods to mitigate 2 greenhouse gas (GHG) emissions. In this technology, pure CO is injected into an underground geological 2 formation and since it is less dense than residual fluids, there is always a risk of leakage to the surface. To increase security of underground CO disposal, ex-situ dissolution can be implemented. When CO is dissolved 2 2 in brine before injection, it significantly reduces the risks of leakage. In this approach, pure CO is dissolved on 2 the surface before injection. Surface dissolution could be achieved in a pipeline operating under the pressure of a target aquifer into which the CO is injected. In a pipeline, CO droplets are dissolved being dispersed in a 2 2 brine turbulent flow. In this paper, a comprehensive model of droplet dissolution along a pipeline is presented. The model accounts for droplet breakup and coalescence processes and is validated against available experimental data.

Cao, H., He, W., 2020. Correlation of carbon isotope stratigraphy and paleoenvironmental conditions in the Cretaceous Jehol Group, northeastern China. International Geology Review 62, 113-128.

https://doi.org/10.1080/00206814.2019.1681303 The Jehol Biota represents an important phase in the history of biological evolution on Earth. Two sites with Aptian Jehol Biota, located in western Liaoning Province and in northern Hebei Province, northeastern China, have generated a major debate about the relationships between their fossil-bearing layers, resulting in confusions about their stratigraphic correlation and biogenetic sequence. We have applied carbon isotope analysis of total organic carbon to provide new data relevant to this debate and have re-examined the connection between volcanism and carbon cycle perturbations, with consideration of the paleoenvironmental conditions. The rare earth element data show that the provenances of the Jehol Group in western Liaoning and northern Hebei were similar and derived mainly from the underlying andesite. Constrained by the radiometric age, the 13 δ C curve suggests that the Dadianzi Formation in northern Hebei is comparable to the three lacustrine layers org of the Yixian Formation (ranging from the Jianshangou Bed to the Jingangshan Bed) in western Liaoning. These layers are highly correlated with the early Aptian marine sequence in Oceanic Anoxic Event 1a (OAE 1a), implying that a possible teleconnection (possibly related to a large igneous province) existed between oceanic and terrestrial realms. We also propose that the Xiguayuan Formation above the Dadianzi Formation in northern Hebei is equivalent to the Huanghuashan Breccia Bed at the top of the Yixian Formation in western 13 Liaoning. Moreover, the δ C and element geochemical data suggest that the carbon cycle perturbation and org the paleolimnological environments were distinctly influenced by the effects of volcanic CO during the early 2 Aptian.

Cao, H., He, W., Chen, F., Kong, D., 2020. Superheavy pyrite in the Upper Cretaceous mudstone of the Songliao Basin, NE China and its implication for paleolimnological environments. Journal of Asian Earth Sciences 189, 104156.

http://www.sciencedirect.com/science/article/pii/S1367912019305085 The widely developed dark mudstone in the Upper Cretaceous Nenjiang Formation of the Songliao Basin is a natural archive for reconstructing the palaeoenvironment. A time series sulfur isotope study on the Nenjiang 34 Formation reveals that authigenic pyrite from the paleo-lake is enriched in S relative to coeval marine sulfate 34 in the lower Nenjiang Member I and basal Nenjiang Member II. The occurrence of S-enriched pyrite must be explained to understand the paleolimnological environment and the sulfur cycling during this period, for which several explanations can be advanced. Based on a comparison of various mechanisms for superheavy pyrite formation, we consider the presence of an anaerobic sulfate minimum zone (SMZ) in the paleo-lake as the most